Fastening element



FIG. 1 is a top, back, right side perspective view of a fastening element;

FIG. 2 is a bottom, front, left side perspective view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a right side view thereof, the left side view being a mirror image of. 

CLAIM The ornamental design for a fastening element, as shown and described. 